package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;

/**
 * 商品三级分类
 *
 * @author 1920139709@qq.com
 * @email 1920139709@qq.com
 * @date 2021-01-07 20:38:03
 */
@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        // 1、查出所有分类 设置为null查询全部
        List<CategoryEntity> entities = baseMapper.selectList(null);

        // 2、组装成父子的树形结构
        List<CategoryEntity> levelList = entities.stream().filter(categoryEntity -> {
            // parentCid ==0 为父目录默认0
            return categoryEntity.getParentCid() == 0;
        }).map(menu -> {
            // 设置二三级分类 递归
            menu.setChildren(getChildrens(menu, entities));
            return menu;
        }).sorted((menu1, menu2) -> {
            //  排序 Sort字段排序
            return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
        }).collect(Collectors.toList());
        return levelList;
    }


    @Override
    public void removeMenuByIds(List<Long> asList) {
        //先检查是否被别的地方使用
        //多会使用逻辑删除,yml配置
        baseMapper.deleteBatchIds(asList);
    }

    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> childer = all.stream().filter(categoryEntity -> {
                    return categoryEntity.getParentCid().equals(root.getCatId());
                }/*找到子菜单*/
        ).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));//递归去查询它的子数据
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            return menu1.getSort() == null ? 0 : menu1.getSort() - (menu2.getSort() == null ? 0 : menu2.getSort());
        }).collect(Collectors.toList());
        return childer;
    }
}